319 



intirior of the valves, probably referable to this species ; from 

 Nullarbor Plains and Fowler's Bay District. H. Y. L. Brown Coll. 



L. 10538. Typical examples in soft limestone resembling chalk ; 

 from jS^ullarbor Plains. U. Y. L. Brown Coll. 



Pecten beethami, Hutton. 



1873. Pecten beethami, Hutton, Cat. Tert. Moll. N.Z. p. 31. 



This species is not figured, but the specimens in the Museum 

 collection, alluded to below, answer the description given by 

 Hutton. They are suborbicular, the right valve is convex, and 

 has numerous small radiating costae, which become broader towards 

 the ventral margin. 



Dimensions. — None of the specimens are perfect ; one has 

 a length of 120 mm. 



Form, and Loc. — Eocene : New Zealand. 



L. 10497, L. 10504. Large fragment imbedded in limestone ; 

 from Culverdcn, Nelson. Sir James Hector Coll. 



L. 10509. An imperfect example of the adult ; from Tata 

 Island. Sir James Hector Coll. 



Pecten semiplicatus, Hutton. 



1873. Pecten semiplicata, Hutton, Cat. Tert. Moll. N.Z. p. 30. 

 1893. Pecten semiplicatus, Hutton, Linn. See. N.S.W., Macleay Mem. Vol. 

 p. 89. 



Ornamented by five or six strong radiating plications near 

 the umbones, which gradually disappear as the ventral margins, 

 in the adult, are reached ; between these are small ribs, commonly 

 rounded at the summit. 



Dimensions. — Height 55 mm. ; length 54 mm, 



Form, and Loc. — Miocene: "Duncan's," East Coast, North 

 Island, New Zealand. 



L. 10542. An imperfect example of the adult. 



Sir James Hector Coll. 



